<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
	</head>
	<body>
	<div id="d1"></div>
		<script>
			 HTMLDivElement.prototype.show = function(){
			 	this.innerHTML = "123";
			 };
			 d1.show();
		</script>
	</body>
</html>
